$$\left( { - \infty ,0} \right) \cup \left( {{3 \over 7},\infty } \right)$$

$$\left( { - \infty ,0} \right) \cup \left( {{{14} \over {15}},\infty } \right)$$

$$\left( { - \infty ,{{14} \over {15}}} \right)$$

$$\left( { - \infty ,{{14} \over {15}}} \right) \cup \left( {0,\infty } \right)$$